1 : power to direct or determine; "under control"
2 : a standard against which other conditions can be compared in a scientific experiment; "the control condition was inappropriate for the conclusions he wished to draw"
3 : discipline in personal and social activities; "he was a model of polite restraint"; "she never lost control of herself"
4 : great skillfulness and knowledge of some subject or activity; "a good command of French"
5 : the state that exists when one person or group has power over another
1 : verify by using a duplicate register for comparison
2 : control (others or oneself) or influence skillfully, usually to one's advantage
3 : have a firm understanding or knowledge of; be on top of
4 : handle and cause to function